A flexible epoxy adhesive for bonding rubber waterstops and its preparation method

Abstract

The present invention provides a flexible epoxy adhesive for bonding rubber waterstops and a preparation method thereof. The adhesive comprises a component A and a component B. The component A includes E51 epoxy resin, a diluent, a toughening agent, an antifoaming agent, an active filler, and a rheological aid. The component B includes a flexible curing agent, a polyamide epoxy curing agent, an active filler, and a rheological aid. The flexible curing agent is a polyetheramine curing agent with a molecular weight of 3500 - 5000. When the joints of the aqueduct undergo displacement, the adhesive of the present invention can expand and contract simultaneously with the rubber waterstop, making it difficult for the rubber waterstop to separate from the concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly to a flexible epoxy adhesive for bonding rubber waterstops and a preparation method thereof. Background Art

[0002] A flume is an overhead water conveyance structure that conveys canal water across rivers, canals, roads, mountain torrents, valley mouths, etc. It is one of the most widely used cross structures in irrigation area hydraulic structures. In addition to conveying canal water, it can also be used for flood discharge and diversion. Water leakage at the expansion joints of the flume affects the safe operation of the flume, and at the same time causes an astonishing waste of irrigation water resources, affecting drought resistance and harvest protection in the irrigation area. Water leakage at the expansion joints is the first occurrence point of diseases in the canal seepage control project. The water seeping into the canal foundation from the expansion joints will make the canal foundation soil in a saturated state, causing the collapse and damage of the canal body. In cold regions in the north, frost heave damage of the canal bed will also occur due to the frost heave of the canal foundation soil. At present, water leakage problems generally exist in the expansion joints of existing flumes. Analysis shows that the failure of the waterstop at the expansion joint is the primary cause of flume leakage.

[0003] The waterstop can use its own elasticity to produce compressive deformation under pressure, increase its bonding area with concrete, prevent water from passing through the seepage channel, and play a role in sealing and water stopping, thus playing a role in fastening and sealing. At the same time, the waterstop must have good adhesiveness and will not cause adhesive failure or cohesive failure when the joint undergoes displacement. The rubber waterstop has high elastic characteristics and is a commonly used expansion joint waterstop material. In addition to the durability of the waterstop, the bonding and sealing between the waterstop and the expansion joint also directly affect the waterstop effect. Epoxy adhesives can be cured at room temperature, have excellent mechanical properties, good bonding strength, good aging resistance, and are environmentally friendly and non-toxic. They are commonly used waterstop bonding materials.

[0004] The invention patent with the patent number CN106947412A discloses a polymer adhesive and an adhesively bondable rubber waterstop. The hardness of this adhesive is high, and it is easy to cause adhesive failure between the waterstop and concrete when the expansion joint of the flume undergoes displacement, resulting in the sealing failure between the waterstop and concrete, thus causing flume leakage. Summary of the Invention

[0005] In view of this, the present invention provides a flexible epoxy adhesive for bonding rubber waterstops at the expansion joints of flumes, which has good flexibility and sealing performance, and a preparation method thereof.

[0006] The technical solution of the present invention is realized as follows: On the one hand, the present invention provides a flexible epoxy adhesive for bonding rubber waterstops, which comprises component A and component B. Component A includes E51 epoxy resin, diluent, toughening agent, defoaming agent, active filler, and rheological aid; Component B includes flexible curing agent, polyamide epoxy curing agent, active filler, and rheological aid; The flexible curing agent is a polyetheramine curing agent with a molecular weight of 3500 - 5000.

[0007] On the basis of the above technical solution, preferably, the weight ratio of component A to component B is 1.0∶(0.8 - 1.2).

[0008] Calculated by weight fraction, component A includes 90 - 110 parts of E51 epoxy resin, 5 - 10 parts of diluent, 5 - 15 parts of toughening agent, 0.2 - 0.5 parts of defoaming agent, 20 - 50 parts of active filler, and 2 - 5 parts of rheological aid.

[0009] Calculated by weight fraction, component B includes 30 - 70 parts of flexible curing agent, 10 - 30 parts of polyamide epoxy curing agent, 65 - 80 parts of active filler, and 3 - 8 parts of rheological aid.

[0010] On the basis of the above technical solution, preferably, the toughening agent is a linear polyurethane prepolymer containing crosslinkable blocked isocyanate groups.

[0011] On the basis of the above technical solution, preferably, the content of isocyanate in the linear polyurethane prepolymer is 1% - 2%.

[0012] On the basis of the above technical solution, preferably, the filler is one or more of active silica powder, heavy calcium carbonate, and quartz powder.

[0013] On the basis of the above technical solution, preferably, the rheological aid is one or more of nano - fumed silica, organic bentonite, and organic flaky silicate.

[0014] On the basis of the above technical solution, preferably, the diluent is a glycidyl ether of a low - viscosity monomer with an epoxy group.

[0015] On the basis of the above technical solution, preferably, the diluent is one or more of polyethylene glycol diglycidyl ether, C12 - 14 - alkyl glycidyl ether, epoxypropane benzyl ether, 1,4 - butanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0016] On the basis of the above technical solution, preferably, the defoaming agent is a polysiloxane compound containing hydrophobic particles.

[0017] On the other hand, the present invention provides a preparation method of a flexible epoxy adhesive for bonding rubber waterstops, comprising the following steps:

[0018] S1, Preparation of component A: First, mix E51 epoxy resin, diluent and toughening agent and stir evenly, then add defoaming agent and stir for 10 - 30 min, then add rheological aid, stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add active filler and stir evenly;

[0019] S2, Preparation of component B: Mix flexible curing agent and polyamide epoxy curing agent and stir evenly, then add rheological aid, stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add active filler and stir evenly;

[0020] S3, Mix component A and component B in proportion to obtain the flexible epoxy adhesive.

[0021] The flexible epoxy adhesive for bonding rubber waterstops and its preparation method of the present invention have the following beneficial effects compared with the prior art:

[0022] (1) The flexible molecular chain segments in the large - molecular - weight polyetheramine curing agent in component B of the present invention can reduce the cross - linking density of the epoxy cured product and increase the flexibility of the material; when compounded with polyamide epoxy curing agent, it can enhance the adhesion between the waterstop and concrete while improving the toughness of the material; at the same time, adjust the reaction rate of the material and improve the construction efficiency of rubber waterstop bonding. When the joint of the aqueduct undergoes displacement, the adhesive of the present invention can expand and contract simultaneously with the rubber waterstop, making it difficult for the rubber waterstop to separate from the concrete.

[0023] (2) The toughening agent in the flexible epoxy adhesive for bonding rubber waterstops of the present invention is a linear polyurethane prepolymer containing cross - linkable blocked isocyanate groups. After pre - mixing with epoxy resin, its flexible groups can effectively increase the elongation rate of the system and improve the toughness of the material.

[0024] (3) The active filler in the flexible epoxy adhesive for bonding rubber waterstops of the present invention is active silica powder, which can reduce the exothermic peak temperature of the epoxy resin curing reaction, reduce the linear expansion coefficient and shrinkage rate of the cured product, thereby eliminating the internal stress of the cured product and preventing the cured product from cracking due to temperature changes.

[0025] (4) The rheological aid in the flexible epoxy adhesive for bonding rubber waterstops of the present invention is organic flaky silicate. The thin - layer flaky structure dispersed in the system can stably increase the thixotropy of the material and solve the problem of material flow during vertical or top - surface construction.

[0026] (5) The flexible epoxy adhesive for bonding rubber waterstops of the present invention has good flexibility and good bonding performance. It does not flow on vertical and top surfaces, and at the same time has good sealing performance to prevent seepage caused by the failure of the waterstop at the expansion joint of the aqueduct. When the expansion joint of the aqueduct undergoes displacement, it can expand and contract simultaneously with the rubber waterstop, making it difficult for the rubber waterstop to separate from the concrete, effectively preventing leakage caused by the failure of the waterstop at the expansion joint of the aqueduct. Detailed implementation manners

[0027] Next, in combination with the implementation manners of the present invention, the technical solutions in the implementation manners of the present invention will be clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present invention, rather than all of the implementation manners. Based on the implementation manners of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] Example 1

[0029] The flexible epoxy adhesive for bonding rubber waterstops in this example includes component A and component B, and the weight ratio of component A to component B is 1.0:1.2.

[0030] Calculated by weight fraction, component A includes 90 parts of E51 epoxy resin, 10 parts of polyethylene glycol diglycidyl ether, 15 parts of linear polyurethane prepolymer containing 1% isocyanate, 0.2 part of polysiloxane defoamer, 20 parts of active silica powder, and 5 parts of nano-aerosil.

[0031] Calculated by weight fraction, component B includes 70 parts of polyetheramine curing agent with a molecular weight of 3500, 10 parts of polyamide epoxy curing agent, 75 parts of active silica powder, and 3 parts of nano-aerosil.

[0032] The preparation method of the flexible epoxy adhesive includes the following steps:

[0033] S1, Preparation of component A: First, mix 9 kg of E51 epoxy resin, 1 kg of polyethylene glycol diglycidyl ether, and 1.5 kg of linear polyurethane prepolymer containing 1% isocyanate and stir evenly, then add 0.01 kg of polysiloxane defoamer and stir for 10 min, then add 0.2 kg of nano-aerosil, stir at a high speed of 2000 revolutions per second for 10 min, and finally add 2 kg of active silica powder and stir evenly;

[0034] S2, Preparation of component B: Mix 7 kg of polyetheramine curing agent with a molecular weight of 3500 and 1 kg of polyamide epoxy curing agent and stir evenly, then add 0.3 kg of nano-aerosil, stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add 7.5 kg of active silica powder and stir evenly;

[0035] S3. Mix component A and component B in a ratio of 1.0:1.2 to obtain the flexible epoxy adhesive.

[0036] Example 2

[0037] The flexible epoxy adhesive for bonding rubber waterstops in this example includes component A and component B, and the weight ratio of component A to component B is 1.0:1.1.

[0038] Calculated by weight fraction, component A includes 100 parts of E51 epoxy resin, 10 parts of C12-14 alkyl glycidyl ether, 8 parts of linear polyurethane prepolymer containing 1.2% isocyanate, 0.2 part of polysiloxane defoamer, 4 parts of organic bentonite, and 30 parts of heavy calcium carbonate.

[0039] Calculated by weight fraction, component B includes 60 parts of polyetheramine curing agent with a molecular weight of 4000, 15 parts of polyamide epoxy curing agent, 4 parts of organic bentonite, and 80 parts of heavy calcium carbonate.

[0040] The preparation method of the flexible epoxy adhesive includes the following steps:

[0041] S1. Preparation of component A: First, mix 10 kg of E51 epoxy resin, 1 kg of C12-14 alkyl glycidyl ether, and 0.8 kg of linear polyurethane prepolymer containing 1.2% isocyanate and stir evenly, then add 0.02 kg of polysiloxane defoamer and stir for 15 min, then add 0.3 kg of organic bentonite, stir at a high speed of 2000 revolutions per second for 12 min, and finally add 3 kg of heavy calcium carbonate and stir evenly;

[0042] S2. Preparation of component B: Mix 6 kg of polyetheramine curing agent with a molecular weight of 4000 and 1.5 kg of polyamide epoxy curing agent and stir evenly, then add 0.4 kg of organic bentonite, stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add 8 kg of heavy calcium carbonate and stir evenly;

[0043] S3. Mix component A and component B in a ratio of 1.0:1.1 to obtain the flexible epoxy adhesive.

[0044] Example 3

[0045] The flexible epoxy adhesive for bonding rubber waterstops in this example includes component A and component B, and the weight ratio of component A to component B is 1.0:1.0.

[0046] Component A, calculated by weight fraction, includes 100 parts of E51 epoxy resin, 5 parts of glycidyl phenyl ether, 10 parts of linear polyurethane prepolymer containing 1.5% isocyanate, 0.3 part of polysiloxane defoamer, 3 parts of organic flaky silicate, and 20 parts of quartz powder.

[0047] Component B, calculated by weight fraction, includes 50 parts of polyetheramine curing agent with a molecular weight of 4500, 20 parts of polyamide epoxy curing agent, 4 parts of organic flaky silicate, and 65 parts of quartz powder.

[0048] The preparation method of the flexible epoxy adhesive includes the following steps:

[0049] S1, Preparation of Component A: First, mix 10 kg of E51 epoxy resin, 0.5 kg of glycidyl phenyl ether, and 1 kg of linear polyurethane prepolymer containing 1.5% isocyanate and stir evenly. Then add 0.03 kg of polysiloxane defoamer and stir for 30 min. Then add 0.4 kg of organic flaky silicate and stir at a high speed of 2000 revolutions per second for 15 min. Finally, add 2 kg of quartz powder and stir evenly.

[0050] S2, Preparation of Component B: Mix 5 kg of polyetheramine curing agent with a molecular weight of 4500 and 2 kg of polyamide epoxy curing agent and stir evenly. Then add 0.5 kg of organic flaky silicate and stir at a high speed of 2000 revolutions per second for 15 min. Finally, add 6.5 kg of quartz powder and stir evenly.

[0051] S3, Mix Component A and Component B in a ratio of 1.0:1.0 to obtain the flexible epoxy adhesive.

[0052] Example 4

[0053] The flexible epoxy adhesive for bonding rubber waterstops in this example includes Component A and Component B, and the weight ratio of Component A to Component B is 1.0∶0.9.

[0054] Component A, calculated by weight fraction, includes 95 parts of E51 epoxy resin, 5 parts of 1,4-butanediol diglycidyl ether, 5 parts of linear polyurethane prepolymer containing 1.8% isocyanate, 0.4 part of polysiloxane defoamer, 2 parts of organic flaky silicate, and 40 parts of activated silica powder.

[0055] Component B, calculated by weight fraction, includes 40 parts of polyetheramine curing agent with a molecular weight of 5000, 20 parts of polyamide epoxy curing agent, 7 parts of nano-aerosil, and 70 parts of heavy calcium carbonate.

[0056] The preparation method of the flexible epoxy adhesive includes the following steps:

[0057] S1, Preparation of Component A: First, mix 9.5 kg of E51 epoxy resin, 0.5 kg of 1,4-butanediol diglycidyl ether, and 0.5 kg of linear polyurethane prepolymer containing 1.8% isocyanate and stir evenly. Then, add 0.04 kg of polysiloxane defoamer and stir for 30 min. Next, add 0.4 kg of organic flaky silicate and stir at a high speed of 2000 revolutions per second for 15 min. Finally, add 4 kg of active silica powder and stir evenly;

[0058] S2, Preparation of Component B: Mix 4 kg of polyetheramine curing agent with a molecular weight of 5000 and 2 kg of polyamide epoxy curing agent and stir evenly. Then, add 0.6 kg of nano-aerosil and stir at a high speed of 2000 revolutions per second for 15 min. Finally, add 7 kg of heavy calcium carbonate and stir evenly;

[0059] S3, Mix Component A and Component B in a ratio of 1.0∶0.9 to obtain the flexible epoxy adhesive.

[0060] Example 5

[0061] The flexible epoxy adhesive for bonding rubber waterstops in this example includes Component A and Component B, and the weight ratio of Component A to Component B is 1.0∶0.8.

[0062] Calculated by weight fraction, Component A includes 110 parts of E51 epoxy resin, 5 parts of neopentyl glycol diglycidyl ether, 10 parts of linear polyurethane prepolymer containing 2% isocyanate, 0.5 part of polysiloxane defoamer, 2 parts of organic flaky silicate, and 50 parts of active silica powder.

[0063] Calculated by weight fraction, Component B includes 30 parts of polyetheramine curing agent with a molecular weight of 5000, 30 parts of polyamide epoxy curing agent, 8 parts of organic flaky silicate, and 70 parts of active silica powder.

[0064] The preparation method of the flexible epoxy adhesive includes the following steps:

[0065] S1, Preparation of Component A: First, mix 1.1 kg of E51 epoxy resin, 0.5 kg of neopentyl glycol diglycidyl ether, and 1 kg of linear polyurethane prepolymer containing 2% isocyanate and stir evenly. Then, add 0.05 kg of polysiloxane defoamer and stir for 30 min. Next, add 0.5 kg of organic flaky silicate and stir at a high speed of 2000 revolutions per second for 15 min. Finally, add 5 kg of active silica powder and stir evenly;

[0066] S2. Preparation of Component B: Mix 3 kg of polyetheramine curing agent with a molecular weight of 5000 and 3 kg of polyamide epoxy curing agent and stir evenly. Then add 0.8 kg of organic flaky silicate, and stir at a high speed of 2000 revolutions per second for 10 - 15 min. Finally, add 7 kg of active silica powder and stir evenly;

[0067] S3. Mix Component A and Component B in a ratio of 1.0∶0.8 to obtain the flexible epoxy adhesive.

[0068] Example 6

[0069] The difference between the flexible epoxy adhesive for bonding rubber waterstops in this example and that in Example 1 is that the weight ratio of Component A to Component B is 1.0∶0.8, and the rest are the same.

[0070] Example 7

[0071] The difference between the flexible epoxy adhesive for bonding rubber waterstops in this example and that in Example 1 is that the molecular weight of the polyetheramine curing agent is 5000, and the rest are the same.

[0072] Example 8

[0073] The difference between the flexible epoxy adhesive for bonding rubber waterstops in this example and that in Example 1 is that in Component B, there are 50 parts of polyetheramine curing agent with a molecular weight of 3500 and 20 parts of polyamide epoxy curing agent, and the rest are the same.

[0074] Example 9

[0075] The difference between the flexible epoxy adhesive for bonding rubber waterstops in this example and that in Example 1 is that the rheological aid is organic flaky silicate, and the rest are the same.

[0076] Example 10

[0077] The difference between the flexible epoxy adhesive for bonding rubber waterstops in this example and that in Example 1 is that the active filler is quartz powder, and the rest are the same.

[0078] Comparative Example 1

[0079] The difference between the flexible epoxy adhesive for bonding rubber waterstops in Comparative Example 1 and that in Example 1 is that it does not contain polyetheramine curing agent, and there are 35 parts of polyamide curing agent, and the rest are the same.

[0080] Comparative Example 2

[0081] The difference between the flexible epoxy adhesive for bonding rubber waterstops in Comparative Example 2 and that in Example 1 is that it does not contain polyamide epoxy curing agent, and there are 100 parts of polyetheramine curing agent, and the rest are the same.

[0082] Comparative Example 3

[0083] The difference between the flexible epoxy adhesive for bonding the rubber waterstop strip in Comparative Example 3 and Example 1 is that the molecular weight of the polyetheramine epoxy curing agent is 2000, and the rest is the same.

[0084] The construction process of flexible epoxy adhesive is as follows: first, treat the concrete base surface to make the bonding surface free of oil, dirt and dust. Before use, stir components A and B separately and evenly (do not use the same stirring rod for components A and B during stirring), then weigh them according to the specified ratio and pour them into the prepared clean container, and stir them thoroughly until the color is uniform; apply the stirred adhesive to the treated base surface and the bonding surface of the waterstop, thick in the middle and thin at the edges, with an average thickness of not less than 3mm, and then bond the waterstop to the predetermined position. After the waterstop is bonded, appropriate pressure should be applied immediately so that the adhesive just squeezes out from the edge.

[0085] The adhesives of the embodiments and comparative examples were constructed according to the above methods and tested. The results are shown in Table 1.

[0086] Table 1 Properties of adhesives

[0087]

[0088]

[0089] As shown in Table 1, the elongation of the adhesive in the examples is higher than that in the comparative example 1, the flexibility of the examples is better, and the comprehensive performance of the example 3 is better.

[0090] Compared with Examples 9 and 10, Example 1 shows that the active filler is preferably silicon micropowder, and the rheological agent is preferably organic sheet silicate. Active silicon micropowder can reduce the exothermic peak temperature of the epoxy resin curing reaction, reduce the linear expansion coefficient and shrinkage rate of the cured product, thereby eliminating the internal stress of the cured product and preventing the cured product from cracking due to temperature changes. The thin layer structure of the organic sheet silicate can stably increase the thixotropy of the material, solve the problem of flow of facade or top surface construction materials, and increase the bonding strength. After the linear polyurethane prepolymer is premixed with the epoxy resin, its flexible group can effectively increase the elongation of the system and improve the toughness of the material.

[0091] Comparative Example 1 does not contain polyetheramine material, the material has no flexibility, high strength, but very low elongation; Comparative Example 2 does not contain polyamide material, has good flexibility, but poor adhesion.

[0092] As shown in Comparative Example 3, by reducing the molecular weight of the polyetheramine epoxy curing agent, the overall performance of the adhesive is reduced, thereby verifying the effect of the adhesive of the present invention.

[0093] The polyetheramine curing agent and polyamide epoxy curing agent of the present invention are compounded to enhance the toughness of the material while strengthening the adhesion between the waterstop and the concrete. When the joint of the aqueduct undergoes displacement, the adhesive of the present invention can expand and contract simultaneously with the rubber waterstop, making it difficult for the rubber waterstop to separate from the concrete.

[0094] The adhesive prepared by the present invention has undergone a simulated waterstop test for the expansion joint of the aqueduct. The following results are obtained by observing the increased width of the live joint when the aqueduct leaks:

[0095] Table 2 Application of Adhesive

[0096] Width increase of live joints during leakage (cm) Whether there is leakage Example 1 6.5 No Comparative Example 1 4.5 Yes Comparative Example 2 4.8 Yes Comparative Example 3 5.5 Yes

[0097] The above results show that the flexible epoxy adhesive of the embodiment of the present invention has good extensibility when used for the expansion joint of the aqueduct. When the increased width of the live joint reaches 6.5, there is no leakage situation, and it can better resist the leakage caused by the displacement of the expansion joint of the aqueduct.

[0098] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible epoxy adhesive for bonding rubber waterstops, characterized in that: It includes Component A and Component B. Component A includes E51 epoxy resin, diluent, toughening agent, defoaming agent, active filler, and rheological aid; Component B includes flexible curing agent, polyamide epoxy curing agent, active filler, and rheological aid; the flexible curing agent is a polyetheramine curing agent with a molecular weight of 3500 - 5000; the weight ratio of Component A to Component B is 1.0∶(0.8 - 1.2); Calculated by weight fraction, Component A includes 90 - 110 parts of E51 epoxy resin, 5 - 10 parts of diluent, 5 - 15 parts of toughening agent, 0.2 - 0.5 parts of defoaming agent, 20 - 50 parts of active filler, and 2 - 5 parts of rheological aid; calculated by weight fraction, Component B includes 30 - 70 parts of flexible curing agent, 10 - 30 parts of polyamide epoxy curing agent, 65 - 80 parts of active filler, and 3 - 8 parts of rheological aid.

2. The flexible epoxy adhesive for bonding rubber waterstops according to claim 1, wherein: The toughening agent is a linear polyurethane prepolymer containing crosslinkable blocked isocyanate groups.

3. The flexible epoxy adhesive for bonding rubber waterstops according to claim 2, characterized in that: The content of isocyanate in the linear polyurethane prepolymer is 1% - 2%.

4. A flexible epoxy adhesive for bonding rubber waterstops as claimed in claim 1, wherein: The active filler in Component A and Component B is one or more of active silica powder, heavy calcium carbonate, and quartz powder.

5. The flexible epoxy adhesive for bonding rubber waterstops according to claim 1, characterized in that: The rheological aid in Component A and Component B is one or more of nano - fumed silica, organic bentonite, and organic flaky silicate.

6. The flexible epoxy adhesive for bonding rubber waterstops according to claim 1, wherein: The diluent is a glycidyl ether of a low - viscosity monomer with an epoxy group.

7. The flexible epoxy adhesive for bonding rubber waterstops according to claim 6, characterized in that: The diluent is one or more of polyethylene glycol diglycidyl ether, C12 - 14 - alkyl glycidyl ether, epoxypropane benzyl ether, 1,4 - butanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

8. The flexible epoxy adhesive for bonding rubber waterstops according to claim 1, characterized in that: The defoaming agent is a polysiloxane compound containing hydrophobic particles.

9. The preparation method of a flexible epoxy adhesive for bonding rubber waterstops according to any one of claims 1-8, characterized in that: It includes the following steps: S1, Preparation of Component A: First, mix and stir evenly E51 epoxy resin, diluent, and toughening agent, then add the defoaming agent and stir for 10 - 30 min, then add the rheological aid, and stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add the active filler and stir evenly. S2, Preparation of Component B: Mix and stir evenly the flexible curing agent and polyamide epoxy curing agent, then add the rheological aid, and stir at a high speed of 2000 revolutions per second for 10 - 15 min, and finally add the active filler and stir evenly. S3, Mix Component A and Component B in proportion to obtain the flexible epoxy adhesive.

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